-99.89% is the change from 911 to 1
Calculation steps:
[( 1 - 911 ) ÷ 911] x 100 = -99.89%
Formula
Percentage change = [(1 - 911) / 911] x 100
Subtract the new number by the original number
1 - 911 = -910
-910 ÷ 911 = -0.9989023051591658
-0.9989023051591658 x 100 = -99.89%